Browse Prior Art Database

Ribbon Normalization by Preheating

IP.com Disclosure Number: IPCOM000038640D
Original Publication Date: 1987-Feb-01
Included in the Prior Art Database: 2005-Jan-31
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Crooks, W: AUTHOR [+3]

Abstract

In resistive ribbon thermal transfer printing, the print quality and liftoff, or correction, are temperature and humidity dependent. This dependency is lessened by preheating the ribbon immediately prior to printing. Accordingly, Joule heating is achieved by having two relatively broad area electrodes in contact with the resistive side of the ribbon on the upstream side of the head, that is, between where the ribbon exits the cartridge and before where the ribbon is contacted by the print electrodes. Current is passed through these electrodes by an amount necessary to raise the temperature of the ribbon a certain amount above ambient. The temperature delta is chosen to desorb water and normalize the ribbon prior to printing.

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Ribbon Normalization by Preheating

In resistive ribbon thermal transfer printing, the print quality and liftoff, or correction, are temperature and humidity dependent. This dependency is lessened by preheating the ribbon immediately prior to printing. Accordingly, Joule heating is achieved by having two relatively broad area electrodes in contact with the resistive side of the ribbon on the upstream side of the head, that is, between where the ribbon exits the cartridge and before where the ribbon is contacted by the print electrodes. Current is passed through these electrodes by an amount necessary to raise the temperature of the ribbon a certain amount above ambient. The temperature delta is chosen to desorb water and normalize the ribbon prior to printing. That is, both the ribbon temperature and the ink moisture content will be approximately the same level during printing or during the self liftoff process independent of the prevailing humidity or the humidity history of the ribbon. This in turn normalizes the performance of the ribbon. A suitable arrangement is shown schematically in the figure.

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